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Sagot :
Step 1 - Understanding energy absorption/releasing
An electron in an atom may interact with light (usually UV light, but visible light as well), thus absorbing a photon, which can cause the electron to jump from on level to another, further away from the nucleus.
This is called atomic absorption. The electron, by jumping from one level to a more energetic one, enters the so called excited state, which is not a higly stable state. As a consequence, the electron soon loses its energy by emitting a photon, thus returning to its original level.
This is called atomic emission. To sumarize then:
atomic absorption - electron goes to a further level by absorbing energy
atomic emission - electron comes back to a less energetic level by liberating energy
Step 2 - Answering the exercise
Note the electron goes from a more energetic level (3rd) to a lesser one (2nd). Therefore, it is liberating heat and returning to the ground state (non-excited, less energetic state).
The correct answer would be thus it releases energy and enters the ground state
Answer: d
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